Application Error net::ERR_CONNECTION_REFUSED (http://localhost:8080/) [ OK ]

Hello,

since the last update of the app

my getting an error running the app in android studio

this is my IONIC info command result : ionic info

Ionic:

Ionic CLI : 6.10.1 (/usr/local/lib/node_modules/@ionic/cli)
Ionic Framework : @ionic/angular 4.1.0
@angular-devkit/build-angular : 0.13.8
@angular-devkit/schematics : 7.2.4
@angular/cli : 7.3.8
@ionic/angular-toolkit : 1.4.1

Cordova:

Cordova CLI : 8.1.2 (cordova-lib@8.1.1)
Cordova Platforms : android 7.1.4
Cordova Plugins : cordova-plugin-ionic-keyboard 2.1.3, cordova-plugin-ionic-webview 4.2.1, (and 17 other plugins)

Utility:

cordova-res (update available: 0.15.1) : 0.6.0
native-run : not installed

System:

NodeJS : v10.21.0 (/usr/bin/node)
npm : 6.14.5
OS : Linux 5.6